1 /*
2 * EL4J, the Extension Library for the J2EE, adds incremental enhancements to
3 * the spring framework, http://el4j.sf.net
4 * Copyright (C) 2006 by ELCA Informatique SA, Av. de la Harpe 22-24,
5 * 1000 Lausanne, Switzerland, http://www.elca.ch
6 *
7 * EL4J is published under the GNU Lesser General Public License (LGPL)
8 * Version 2.1. See http://www.gnu.org/licenses/
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU Lesser General Public License for more details.
14 *
15 * For alternative licensing, please contact info@elca.ch
16 */
17 package ch.elca.el4j.util.observer;
18
19 /**
20 * An object observing (i.e. receiving change notifications about) a reference
21 * of type T.
22 *
23 * @svnLink $Revision: 3884 $;$Date: 2009-08-04 15:48:31 +0200 (Di, 04. Aug 2009) $;$Author: swismer $;$URL: https://el4j.svn.sourceforge.net/svnroot/el4j/branches/el4j_3_1/el4j/framework/modules/core/src/main/java/ch/elca/el4j/util/observer/ValueObserver.java $
24 *
25 * @param <T> see above
26 * @see ObservableValue
27 * @see InquisitiveValueObserver
28 * @author Adrian Moos (AMS)
29 */
30 public interface ValueObserver<T> {
31 /** Invoked if the observed reference has changed.
32 * Implementations may not assume that other value observers
33 * have already received their notifications.
34 * @param newRef the new reference */
35 void changed(T newRef);
36 }